how add more field to wp user and save it to database

You want to use the WordPress function; add_user_meta

add_user_meta( $user_id, '_level_of_awesomeness', $awesome_level);

https://developer.wordpress.org/reference/functions/add_user_meta/

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)